Analog phones

AudioCodes MediaPack FXS Gateways (applies 100V DC on line for bulb in handset)

ISDN phones/devices

Have a look at ETS 300 650 and ETS 300 196 (www.etsi.org). To do this stuff with a PC and a standard ISDN controller have a look atCAPI 2.0 4. edition part 3 "Supplementary Services" (www.capi.org)It would come in an "Information" message with a Feature Activation for the proper button/key number.

Analog phones

AudioCodes MediaPack FXS Gateways (applies 100V DC on line for bulb in handset)

ISDN phones/devices

Have a look at ETS 300 650 and ETS 300 196 (www.etsi.org). To do this stuff with a PC and a standard ISDN controller have a look atCAPI 2.0 4. edition part 3 "Supplementary Services" (www.capi.org)It would come in an "Information" message with a Feature Activation for the proper button/key number.